Weather Overview November 20, 2013

A dry arctic airmass throughout BC will dominate over southern BC today and Thursday with only some higher cloud expected.

In the north, a strong westerly flow will cause moisture to spill over an offshore upper ridge. Light density snow is expected over the North Coast as temperatures remain cold aloft. Some light snow will reach the Northern Columbias and North Rockies later tonight and then intensify on Thursday. Offshore, a southwest flow will drive a warm front towards the Alaska panhandle and begin to bring warmer air to BC. As the arctic air in the south slowly modifies, the arctic front will retreat to northeastern BC.

On Friday, the flow offshore backs to more southerly and a frontal band is aimed at the Alaska panhandle. This will cut off the moisture feed to the BC interior and cause freezing levels to rise.

There is good confidence in the forecast since models are in good agreement through the period.

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